Playing a mentally derailed ballerina in Black Swan was so taxing for Natalie Portman that the actress felt she should have checked into a rehab to overcome the effects.
Portman, who won the Best Actress Oscar for her brilliant portrayal of repressed Nina in Darren Aronofsky's movie on the balle world, has often talked about the intensity of the role, which left her exhausted.
Portman feels that instead of starting work on her next movie Thor she should have taken a break.
"I loved Darren Aronofsky and working with him was a deeply fulfilling experience but I just showed up for Thor spent. I probably should have gone into rehab."
However, the 29-year-old star, who is currently expecting her first child with fiance Benjamin Millepied, was thrilled to work with director Kenneth Branagh on 'Thor' because she has always been of his work.
"I must have watched Much Ado About Nothing about 500 times, I love that film so much. He was one of the first people I've met that I was excited about when I met them. When I worked with him, it exceeded my expectations."